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Photon correlation transients in a weakly blockaded Rydberg ensemble.

Möhl, Charles and Spong, Nicholas L. R. and Jiao, Yuechun and So, Chloe and Ilieva, Teodora and Weidemüller, Matthias and Adams, Charles S. (2020) 'Photon correlation transients in a weakly blockaded Rydberg ensemble.', Journal of physics B : atomic, molecular and optical physics., 53 (8). 084005.


The nonlinear and non-local effects in atomic Rydberg media under electromagnetically induced transparency (EIT) make it a versatile platform for fundamental studies and applications in quantum information. In this paper, we study the dynamics of a Rydberg-EIT system in an ensemble that allows for more than one Rydberg excitation in the propagation direction. The density of two-level atoms is such that transient superradiant effects occur. We experimentally observe a cross-over between coherent collective emission ('flash') of two-level atoms to a Rydberg dressed regime ('dressed flash') under EIT condition. The complex dynamics are characterised using both intensity and time correlation measurements. We show that while steady-state EIT gives a second order correlation g (2) = 0.79 ± 0.04, the Rydberg-dressed flash exhibits anti-bunching down to 0.2 ± 0.04.

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Publisher statement:Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Date accepted:03 February 2020
Date deposited:16 April 2020
Date of first online publication:28 April 2020
Date first made open access:16 April 2020

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